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forency-mcp

forency-mcp

by cheevahagadog
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Remote

Forency — Website Technology Forensics

Detect the technology stack behind any website: CMS, ecommerce, JavaScript frameworks, analytics, CRM, marketing automation, payments, chat, CDN, and hosting. Built for AI agents first (MCP server), humans second (REST API + playground).

Why

BuiltWith's API starts at $295/mo, Wappalyzer's at $250/mo, and neither ships an MCP server. Forency covers the ~100 technologies that actually drive prospecting and competitive research, starts free, and tops out at $49/mo.

Related MCP server: techstack-detective-mcp

Stack

Layer

Choice

App

Next.js 16 (App Router, TypeScript, Tailwind 4) on Vercel

Detection

In-house engine over a curated fingerprint set derived from webappanalyzer (GPL-3.0)

Database

Postgres (Neon) via Prisma 7

Auth

Auth.js v5 — GitHub + Google

Billing

Stripe Checkout subscriptions + webhook

MCP

packages/mcp — TypeScript, stdio, published to npm

Layout

app/
  page.tsx              landing + free playground
  pricing/ docs/ dashboard/
  api/
    v1/lookup   POST {url}   → metered, Bearer key
    v1/batch    POST {urls}  → up to 25 URLs
    scan        playground (no key, 3/day per IP)
    key         issue/rotate a user's API key
    stripe/     checkout · portal · webhook
    auth/       Auth.js handlers
lib/
  engine/       detect.ts · curated-list.ts · custom-patterns.ts · fingerprints.json
  api-auth.ts   key auth + atomic monthly metering
  plans.ts keys.ts prisma.ts stripe.ts
packages/mcp/   the published MCP server
scripts/
  build-fingerprints.ts   regenerate fingerprints.json from upstream
  eval-engine.ts          detection accuracy harness (25 known sites)
  test-funnel.ts          end-to-end: key → free tier → 429 → upgrade
  test-mcp.ts             drives the MCP server over stdio

Local development

npm install
cp .env.example .env          # fill in the values

# local Postgres
docker run -d --name forency-pg \
  -e POSTGRES_USER=forency -e POSTGRES_PASSWORD=forency -e POSTGRES_DB=forency \
  -p 5433:5432 postgres:16-alpine

npx prisma migrate dev
npm run dev

Verification

npx tsx scripts/eval-engine.ts              # detection accuracy (25/25 expected)
npx tsx scripts/eval-engine.ts example.com  # scan one site, full JSON

# with the dev server running:
npx tsx scripts/test-funnel.ts              # billing funnel end to end
cd packages/mcp && npm run build && cd ../..
npx tsx scripts/test-mcp.ts                 # MCP server over stdio

Refreshing detection

lib/engine/fingerprints.json is a vendored snapshot. To pull upstream changes or add technologies, edit lib/engine/curated-list.ts and run:

npx tsx scripts/build-fingerprints.ts

The script fails loudly if a curated name doesn't exist upstream and suggests near matches. Tier-1 technologies that upstream detects poorly get overlays in lib/engine/custom-patterns.ts.

License

Application code: MIT. Detection patterns derive from webappanalyzer (GPL-3.0) and are used server-side; they are not redistributed in the npm package.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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    Resources

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